I'm a fan of Polish propaganda posters. Some of you probably know the "polish poster style", many portals like cracked.com posted collections of bizarre polish movie posters, but this is something else.
The tradition didn't star then, but I especially like ww2 posters like:
(wara is an anachronism and it basically means "I won't let you (enter, or do anything else)"
"England, this is your doing"
"To Arms! In the ranks of the home army"
And then there is the iron curtain period, when soviet realism was the only way to go, it gave us things like:
"College students! We're working for you and waiting for you"
"Youth! Come forth and join the fight for a happy socialist countryside"
Yes, that's the rhetoric or language they used, it was a part indoctrination, this notion that socialism can be injected through language
And my personal favorite
"Moonshine! It will make you blind"
Just a small sample.